Where can i get a battery powered usb charger?

I have an old ipod touch that doesn’t hold a charge for more than 2 hours. Where can i get a USB charging plug that, instead of plugging into the wall, it runs on batteries.
Is there such a thing? If not are there any battery powered outlets. So you put the batteries in a box then i plug my ipod charger into that box, then i plug my ipod into the ipod charger.
HELP all i need is a link to ebay or something.

yo can get them at your local walmart store they are kind of expensive tough

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